What Happens When Human Species Are Nearing Extinction? Inbreeding, Murder, And Cannibalism, Says El Sidrón CaveThirty thousand years ago, humans became the last standing human species. Our sister species, Homo neanderthalensis, had held on the longest of all the others, but at last it too was gone. Only Homo sapiens remained. The fate of Neanderthals is the closest we’ll ever get to knowing...